It kind of sounds like what you want is revision control software, things like SVN or GIT.
Once you get into locking and version control, you've probably gone beyond the abilities of simple cloud storage created for use by the general public.
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"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
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